When I was in the three-year retreat, we learned probably 150 different meditation practices. I’ve never gone through and actually counted them. But I remember very distinctly reading a small section at the end of one book that was full of quite advanced practices. And there’s a series of quotations from different teachers in this particular tradition--the Shangpa tradition--and one of them has just stayed with me, really made an impression. It’s by a person called Kyergongpa Chökyi Senge, who lived in the 12th century in Tibet. And this is not an exact quote, but it's to the effect that there are three doors in practice. One is death and impermanence, the second door is compassion, and the third door is devotion/insight. They end up being the same door. And then he said a little bit about each one of those. And I found that, over the years, to be very true. If you look in the Theravadan texts, they explain that death and impermanence is the door for certain kinds of people and compassion is the door for other kinds of people, and devotion is the door for other kinds of people.